<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
        *{
            margin: 0;
            padding: 0;
        }
        .test {
            color: #ffffff;
            width: 64px;
            height: 64px;
            border-radius: 32px;
            border-top-right-radius: 0;
            background: #00aaff;
        }
        p{
            line-height: 64px;
            width: 64px;
            text-align: center;
        }
    </style>
</head>
<body>
<div class="test">
    <p>123</p>
</div>
</body>
</html>